Rename ImportJob to MultiJob and generalize

src/frontend/helpers/multi_job.h

@@ -0,0 +1,54 @@
+// Copyright 2019 threeSD Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <atomic>
+#include <functional>
+#include <QThread>
+#include "core/importer.h"
+
+class MultiJob : public QThread {
+    Q_OBJECT
+
+public:
+    using ExecuteFunc = std::function<bool(Core::SDMCImporter&, const Core::ContentSpecifier&,
+                                           const Core::SDMCImporter::ProgressCallback&)>;
+    using DeleteFunc = std::function<void(Core::SDMCImporter&, const Core::ContentSpecifier&)>;
+
+    explicit MultiJob(QObject* parent, Core::SDMCImporter& importer,
+                      std::vector<Core::ContentSpecifier> contents, ExecuteFunc execute_func,
+                      DeleteFunc delete_func);
+    ~MultiJob() override;
+
+    void run() override;
+    void Cancel();
+
+    std::vector<Core::ContentSpecifier> GetFailedContents() const;
+
+signals:
+    /**
+     * Called when progress is updated on the current content.
+     * @param total_size_imported Total imported size taking all previous contents into
+     * consideration.
+     * @param current_size_imported Imported size of the current content.
+     * @param eta ETA in seconds, 0 when not determined.
+     */
+    void ProgressUpdated(u64 total_size_imported, u64 current_size_imported, int eta);
+
+    /// Dumping of a content has been finished, go on to the next. Called at start as well.
+    void NextContent(u64 size_imported, u64 count, Core::ContentSpecifier next_content, int eta);
+
+    void Completed();
+
+private:
+    std::atomic_bool cancelled{false};
+    Core::SDMCImporter& importer;
+    std::vector<Core::ContentSpecifier> contents;
+    std::vector<Core::ContentSpecifier> failed_contents;
+    ExecuteFunc execute_func;
+    DeleteFunc delete_func;
+};
+
+Q_DECLARE_METATYPE(Core::ContentSpecifier)